Hi Bala Krishna,
i don't have much more idea about this but last time i have added few fields using aet in crm web ui what fields are stored in but000 and then same fields i have created in ecc kna1 table. i had applied one note to populate this data. go through this.
Data Transfer from ECC TO CRM & CRM TO ECC for ZFIELDS & Debug the Interface
i had gone through this link and i populated those data from crm to ecc.
Exchange ECC customer master standard field with the CRM Z- fields (ECC -> CRM)
Thanks & Regards,
Srinivas.